Nut-lock.



J. T. PEARMAN.

PATENTED MAR. 3 1, 190s.

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f UNITED STATES JOHN THOMAS PEARMAN, OF LAKE CITY, ARKANSAS.

NUT-LOCK.

SPECFICATION forming part 0f Letters Patent No. 723,910, dated March 31, 1903.

Application ined Alrn ze, 1902.

To all whom t may concern:

Be it known that I, JOHN THOMAS PEAR- MAN, a citizen of the United States, residing at Lake City, in the county of Oraighead and State of Arkansas, have invented a new and useful Nut-Lock, of which the following is a specification.

This invention relates to improvements in nut-locks, and has for its object to improve the construction of nut-locks and to provide a simple, eifective, and inexpensive device which is adapted for use in connection with any form of nut and in any locality where nuts are employed.

The device may be employed in any desired locality, but is more particularly applicable to railway-rail joints, and for the purpose of illustration it is shown in the drawings thus applied.

Figure 1 is aside view representing the device applied to a railway-rail joint. Fig. 2 is a transverse section on the line a; of Fig. 1. Fig. 3 is a sectional view on the line y y of Fig. 1.

The adjacent sections of the railway-rails are shown at 10 11, the coupling-bars or fishplates at 12 13, respectively, the bindingbolts at 14, and the nuts at 15. Thecoupling-plates 12 and 13 may be of the ordinary construction or of special construction.

Formed in the plate 12 adjacent to the perforation for the bolt is a recess having the side 17 next the bolt straight and the other side doubly inclined, as at 17", or both vertically and transversely, so that the recess is doubly wedge-shaped on one side, the transverse inclination being undercut. (See Fig. 3.) Within this recess a key-plug 18 is adapted to t, having one side straight and conforming t0 and engaging the straight side of the recess and the other side doubly inclined and conforming to and engaging the doubly-inclined side of the recess, as shown. Thekey-pluglextends outward beyond the face of the plate, so that it engages one side of the nut 15, and thus preventsitfrom turning. By the double inclination of the recess the plug is not only held bya wedge force,but also prevented from moving outward from the face of the plate. This is an important feature of the invention and adds materially to the efticiency of the device, as the key-plug is thereserial No. 104,853. (No man.)

connection with railway-rail joints the re-v cess for the reception of the wedge may be formed in any stationary object, such as av washer-plate or the adjacent portion of the frame, bed-plate, or other feature of a machine. l

The key-plug is provided with a hood-like extension 19, projecting laterally and forming a covering to the nut 15 and also affording an additional support to the nut by engaging it on the opposite side by the outer wall of the hood portion, as shown. The hood-like projection thus serves the double purpose of a shield or guard to the nut and also as an additional support thereto. At the upper end the shield portion 19 is formed with a vliange or rib 19", extending over the upper edge of theplate and affording an additional holding means. l

By this simple means a very simple, effective, and inexpensive means for locking a nut in place is produced, which may be readily applied inthe various localities where nut-locks are required.

The device may be of any size to adapt it to all the various sizes of nuts and bolts.

Having thus described my invention, what I claim is 1. As a new article of manufacture, a nutlock comprising a hood to receive a nut and provided at one of its lateral edges with a wedge for engaging an undercut recess.

2. A Vnut-lock comprising a Washer-plate perforated to receive the bolt, and having an inwardly-tapered recess adjacent to said perforation, the side of said recess next said perforation being straight andthe other side inclined longitudinally and transversely, a keyplug having one straight and one inclined side corresponding to and engaging said recess and extending into engagement with the nut, and a shield integral with said key-plug and adapted to inclose the nut, substantially as described.

IOO

A nut-lock comprising a washer-plate perforated to receive the bolt, a recess in said washer-plate adjacent to said perforation, a key-plug engaging said recess and extended to engage the nut, and a shield carried by said key-plug and inclosing the nut, substantially as described.

4. A nut-lock comprising a washer-plate perforated to receive the bolt, and having a recess adjacent to said perforation, a keyplug engaging said recess and extended to engage the nut, a shield integral with said key-plug and inclosing the nut, and with a flange extended to engage the Washer-plate, substantially as described.

5. In a nut-lock, a railWay-rail-joint coupling-plate having a Washer-plate integral JQHN THOMAS PEARMAN.

\Vitn esses:

ALBERT STRATTON, W. W. TAYLOR. 

